40 ILCS 5/16-199
None of the benefits provided for in this Article shall be paid to any person who is convicted of any felony relating to or arising out of or in connection with his or her service as a teacher.
None of the benefits provided for in this Article shall be paid to any person who otherwise would receive a survivor benefit who is convicted of any felony relating to or arising out of or in connection with the service of the teacher from whom the benefit results.
This Section shall not operate to impair any contract or vested right acquired prior to July 9, 1955 under any law or laws continued in this Article, nor to preclude the right to a refund, and for the changes under this amendatory Act of the 100th General Assembly, shall not impair any contract or vested right acquired by a survivor prior to the effective date of this amendatory Act of the 100th General Assembly. The System may sue any such person to collect all moneys paid in excess of refundable contributions.
All teachers entering or re-entering service after July 9, 1955 shall be deemed to have consented to the provisions of this Section as a condition of membership, and all participants entering service subsequent to the effective date of this amendatory Act of the 100th General Assembly shall be deemed to have consented to the provisions of this amendatory Act as a condition of participation.
40 ILCS 5/16-199